CN105242073A - Constant temperature hot wire wind-velocity indicator detection system - Google Patents
Constant temperature hot wire wind-velocity indicator detection system Download PDFInfo
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- CN105242073A CN105242073A CN201510703025.2A CN201510703025A CN105242073A CN 105242073 A CN105242073 A CN 105242073A CN 201510703025 A CN201510703025 A CN 201510703025A CN 105242073 A CN105242073 A CN 105242073A
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Abstract
The invention discloses a constant temperature hot wire wind-velocity indicator detection system. The self-detection system is integrated in a regular circuit of the constant temperature hot wire anemograph (CTA); the CTA regular circuit comprises a Wheatstone bridge, a current limiting protection circuit, an amplifier, an offset signal module and a current driving circuit. The self-detection system comprises a relay module, a current constant module, a hot wire replacement resistor, a first fixed resistor, a second fixed resistor, a third fixed resistor, a control collection module, a display module and a detection switch. The detection switch is used for realizing the switching of the CTA working modes; when the detection switch is switched to a self-detection mode, the following contents can be detected: the fixed resistor value in the bridge path, the hot wire resistance, an overheating rate, an amplifier gain, a current driving circuit working state, and the current limiting protection circuit working state. The detection result is directly displayed in the display module and the detection result is direct and clear. The detection system designs a convenient detection process and improves the reliability and maintenance of the temperature constant hot wire anemograph.
Description
Technical field
The present invention relates to field tests, particularly relate to a kind of thermostatic type hot-wire anemometer detection system.
Background technology
Hot-wire anemometer can realize the continuous coverage of wind speed, and signal to noise ratio (S/N ratio) is high, and can carry out the measurement of three-dimensional flow field and gentle breeze speed, and measurement range and sensitivity are all higher.Because hot-wire anemometer has above-mentioned advantage, so import and export the fields such as the flow behavior measurement in flow field in flow field survey and turbine be widely applied at Flow Field in Wind Tunnel distribution measuring, engine.The reliability of hot-wire anemometer has directly had influence on the availability of instrument and the precision level of measurement result, therefore in the urgent need to a kind of detection system that can detect in circuit, whether various piece can normally work easily.
At present from the product of thermostatic type hot-wire anemometer producer Dantec or TSI of international mainstream, whether hot-wire anemometer can normally work judges based on experience by user completely, these professional standards for user propose higher requirement, also have impact on the test job efficiency of instrument, be more not easy to the maintenance of testing apparatus.
Summary of the invention
Technical matters to be solved by this invention is for defect involved in background technology, provides a kind of thermostatic type hot-wire anemometer detection system, detects whether each key link in thermostatic type hot-wire anemometer can reliably work easily.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Thermostatic type hot-wire anemometer detection system, the CTA circuit of described thermostatic type hot-wire anemometer comprises Wheatstone bridge, current-limiting protection circuit, amplifier, offset signal module and current driving circuit, wherein, the input end of Wheatstone bridge is connected with the output terminal of current driving circuit; The output signal of amplifier superposes the input end of rear input current driving circuit with the output signal of offset signal module; Current-limiting protection circuit is arranged in the brachium pontis at hot line place in Wheatstone bridge, for the protection of hot line;
Described detection system comprises relay module, constant current source module, hot line substitutional resistance, the first to the 3rd fixed resistance, controls acquisition module, display module and detector switch;
Described relay module comprises the first to the 3rd single channel relay, the first to the 3rd two-way relay and relay drive unit;
Described relay drive unit respectively with the first is connected, for driving the described first to the 3rd single channel relay, the first to the 3rd two-way relay work to the control end of the control end of the 3rd single channel relay, the first to the 3rd two-way relay;
Described first single channel relay, the second single channel relay are separately positioned on the input end of Wheatstone bridge two brachium pontis, and its Chang Kaiduan all connects the input end of constant current source module, for realizing the switching between the mode of operation of bridge road;
Described 3rd single channel relay is arranged between the hot line of Wheatstone bridge and hot line substitutional resistance, for realizing the switching in Wheatstone bridge between hot line and hot line substitutional resistance;
Described first two-way relay is arranged in current-limiting protection circuit, for realizing the break-make of hot line place brachium pontis in Wheatstone bridge;
The common port of described second two-way relay is connected with the input end of amplifier, and normal-closed end is connected with the output terminal of Wheatstone bridge, and Chang Kaiduan connects one end of the first fixed resistance, one end of the second fixed resistance respectively;
The common port of described 3rd two-way relay is by the 3rd fixed resistance ground connection, and normal-closed end is unsettled, and Chang Kaiduan connects one end of constant current source module, the first fixed resistance respectively;
The other end of described first fixed resistance, the other end ground connection of the second fixed resistance;
Described bridge road current-limiting protection circuit is connected with relay drive unit, controls the first two-way relay work by it;
Described control acquisition module is connected with relay drive unit, controls the first to the 3rd single channel relay, the second to the 3rd two-way relay work by it;
Described control acquisition module is also connected with constant current source module, offset signal module, detector switch, display module respectively;
The instruction that described constant current source module is used for according to controlling acquisition module produces corresponding electric current;
Described detector switch is used for sending sense command towards control acquisition module;
Described display module is for showing testing result.
As the further prioritization scheme of thermostatic type hot-wire anemometer detection system of the present invention, described control acquisition module is based on ARM chip, its output terminal producing DO signal is connected with the input end of relay drive unit, the output terminal producing DA signal is connected with the input end of constant current source module, the input end of offset signal module, and when receiving sense command, CTA voltage is by controlling the AD input end collection of acquisition module.
As the further prioritization scheme of thermostatic type hot-wire anemometer detection system of the present invention, described display module adopts LED screen.
As the further prioritization scheme of thermostatic type hot-wire anemometer detection system of the present invention, described relay driving module adopts ULN2003 chip.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1. can realize the switching of thermostatic type hot-wire anemometer between normal mode of operation and detecting pattern under control acquisition module;
2. work as thermostatic type hot-wire anemometer place in a detection mode, can detect following project easily: 1) fixed resistance resistance in bridge road; 2) hot line resistance; 3) ratio of specific heat is crossed; 4) amplifier gain; 5) current driving circuit; 6) current-limiting protection circuit;
3. can detect the abort situation of hot-wire anemometer rapidly;
4. testing process is without the need to any setting parameter, is all automatically completed by control acquisition module;
5. testing result directly shows in display module LED screen, has simple and clear feature.
Accompanying drawing explanation
Accompanying drawing 1 is theory diagram of the present invention;
Accompanying drawing 2 is conventional CTA circuit theory diagrams;
Accompanying drawing 3 is bridge resistance,s and crosses ratio of specific heat testing circuit schematic diagram;
Accompanying drawing 4 is amplifier gain and current driving circuit testing circuit schematic diagram;
Accompanying drawing 5 is current-limiting protection circuit testing circuit schematic diagrams.
In figure, 1-first single channel relay, 2-second single channel relay, 3-the 3rd single channel relay, 4-constant current source module, 5-first two-way relay, 6-second two-way relay, 7-the 3rd two-way relay, 8-first fixed resistance, 9-second fixed resistance, 10-the 3rd fixed resistance, 11-first two-way relay electricity circle.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
The invention discloses a kind of thermostatic type hot-wire anemometer detection system, as shown in Figure 2, the CTA circuit of described thermostatic type hot-wire anemometer comprises Wheatstone bridge, current-limiting protection circuit, amplifier, offset signal module and current driving circuit, wherein, the input end of Wheatstone bridge is connected with the output terminal of current driving circuit; The output signal of amplifier superposes the input end of rear input current driving circuit with the output signal of offset signal module; Current-limiting protection circuit is arranged in the brachium pontis at hot line place in Wheatstone bridge, for the protection of hot line.
As shown in Figure 1, detection system of the present invention comprises relay module, constant current source module, hot line substitutional resistance, the first to the 3rd fixed resistance, controls acquisition module, display module and detector switch;
Described relay module comprises the first to the 3rd single channel relay, the first to the 3rd two-way relay and relay drive unit;
Described relay drive unit respectively with the first is connected, for driving the described first to the 3rd single channel relay, the first to the 3rd two-way relay work to the control end of the control end of the 3rd single channel relay, the first to the 3rd two-way relay;
Described first single channel relay, the second single channel relay are separately positioned on the input end of Wheatstone bridge two brachium pontis, and its Chang Kaiduan all connects the input end of constant current source module, for realizing the switching between the mode of operation of bridge road;
Described 3rd single channel relay is arranged between the hot line of Wheatstone bridge and hot line substitutional resistance, for realizing the switching in Wheatstone bridge between hot line and hot line substitutional resistance;
Described first two-way relay is arranged in current-limiting protection circuit, for realizing the break-make of hot line place brachium pontis in Wheatstone bridge;
The common port of described second two-way relay is connected with the input end of amplifier, and normal-closed end is connected with the output terminal of Wheatstone bridge, and Chang Kaiduan connects one end of the first fixed resistance, one end of the second fixed resistance respectively;
The common port of described 3rd two-way relay is by the 3rd fixed resistance ground connection, and normal-closed end is unsettled, and Chang Kaiduan connects one end of constant current source module, the first fixed resistance respectively;
The other end of described first fixed resistance, the other end ground connection of the second fixed resistance;
Described bridge road current-limiting protection circuit is connected with relay drive unit, controls the first two-way relay work by it;
Described control acquisition module is connected with relay drive unit, controls the first to the 3rd single channel relay, the second to the 3rd two-way relay work by it;
Described control acquisition module is also connected with constant current source module, offset signal module, detector switch, display module respectively;
The instruction that described constant current source module is used for according to controlling acquisition module produces corresponding electric current;
Described detector switch is used for sending sense command towards control acquisition module;
Described display module is for showing testing result.
Contrast Fig. 3 and Fig. 4, the first single channel relay is positioned at fixed resistance R
a1and between current driving circuit, for controlling the switching of electric bridge left side brachium pontis mode of operation; Second single channel relay is positioned at fixed resistance R
band between current driving circuit, for controlling the switching of brachium pontis mode of operation on the right of electric bridge.When carrying out electric circuit inspection, stirring detector switch, controlling first to carry out the detection of bridge road after acquisition module receives the instruction of switch.Control acquisition module output DO signal controls the first single channel relay and first works.Fixed resistance R now on bridge road
a1be connected with constant current source module, fixed resistance R on bridge road can be learnt by the value measuring Uw2, U+
a1+ R
a2and hot line R
wresistance.The fixed resistance R when cold conditions owing to crossing ratio of specific heat
bwith hot line R
wratio, so when carrying out resistance and detecting, the electric current that constant current source module feeds is very little, and therefore the voltage at resistance two ends is very little, thus the precision that impact is measured, in order to solve the problem, the voltage at resistance two ends is accessed respectively the amplifier in Fig. 4 by multiplexer ADG609, measure after being amplified by voltage again, common port DA, DB of ADG609 are connected with the input end of amplifier, make the Enable Pin EN of ADG609 be in high level, now S1 passage is for measuring fixed resistance R
a1+ R
a2resistance, S2 passage is for measuring fixed resistance R
cresistance, S3 passage is for measuring hot line R
wresistance, S4 passage is for measuring fixed resistance R
bresistance.Control the service aisle of acquisition module by control ADG609, successively collect fixed resistance R
a1+ R
a2with hot line R
wthe voltage at two ends, and carry out logical calculated, the LED screen fixed resistance resistance after having calculated, hot line resistance being sent to display module shows, now fixed resistance R
a1+ R
a2, hot line R
wresistance detect terminate.
Then, control acquisition module and make the second single channel relay work, the fixed resistance R now on bridge road
bbe connected with constant current source module, fixed resistance R on bridge road can be learnt by the value measuring Uw1, U-
band R
cresistance.Control the service aisle of acquisition module by control ADG609, successively collect fixed resistance R
band R
cthe voltage at two ends, and carry out logical calculated, by the fixed resistance R after having calculated
b, R
cresistance and crossing in LED screen that ratio of specific heat delivers to display module show, now bridge road is detected and is terminated.
Contrast Fig. 4, the common port of the second two-way relay is connected with the input end of amplifier, and normal-closed end is connected with the output terminal of Wheatstone bridge, and Chang Kaiduan is respectively by first, second fixed resistance ground connection; The common port of the 3rd two-way relay is by the 3rd fixed resistance ground connection, and normal-closed end is unsettled, and Chang Kaiduan is connected with the first fixed resistance respectively at constant current source.Amplifier gain detection is carried out after detecting and terminating in bridge road, control acquisition module makes second, third two-way relay work by sending DO signal simultaneously, now the input end of amplifier is connected with the standard voltage signal jointly produced by constant current source module and the 3rd fixed resistance, makes bias voltage U
qbe zero, control the U that acquisition module will collect
0signal and standard voltage signal calculate, and are amplified device yield value, and the LED screen being sent to display module shows, and so far amplifier gain value detects and terminates.
Contrast Fig. 3 and Fig. 4, the common port of the 3rd single channel relay and fixed resistance R
a2be connected, normal-closed end and hot line R
wbe connected, Chang Kaiduan and hot line substitutional resistance R
w' be connected.Amplifier gain value carries out current driving circuit detection after detecting and terminating, and controls acquisition module and makes the 3rd single channel relay and the second two-way relay work by sending DO signal simultaneously.Now, hot line substitutional resistance R
w' substitute hot line R
waccess electric bridge carries out work, can avoid like this burning out hot line R in testing process
w.Due to the second two-way relay work, the 3rd two-way relay does not work, so now the input end of amplifier is respectively by first, second fixed resistance ground connection, the input of current driving circuit is by bias voltage U
qindependent decision.Control the U of current driving circuit output terminal of acquisition module by collecting
wafter carry out judgement current driving circuit and can normally work, and send result to display module, if can normally work, LED screen shows " current driving circuit normally works ", if can not, show " current driving circuit non-normal working ", now, current driving circuit detects and terminates.
Contrast Fig. 3 and Fig. 5, common port one end of the first two-way relay and hot line R
wbe connected, the other end with control the input end of ARM in acquisition module and be connected, normal-closed end respectively with fixed resistance R
a2be connected and be connected with 3.3V power supply by fixed resistance, one end ground connection of Chang Kaiduan, the other end is unsettled, and this relay is controlled by current-limiting protection circuit, for controlling hot line R
wthe break-make of place brachium pontis.After current driving circuit detects and terminates, current-limiting protection circuit detects, and now control acquisition module sends DO signal and makes the 3rd single channel relay work, now, and hot line substitutional resistance R
w' substitute hot line R
waccess electric bridge carries out work, avoids burning out hot line R in testing process
w.Control acquisition module and DA signal is passed to current-limiting protection circuit, i.e. given UDA, make Limited Current be less than now fixed resistance R
a2electric current in the brachium pontis of place; if now the second contact of the first two-way relay becomes low level from high level, show that current-limiting protection circuit can normally work; control can to send result to display module after acquisition module collects signal to show; if level is by high step-down; LED then shows " current-limiting protection circuit normally works "; if level does not change; then show " current-limiting protection circuit non-normal working "; now all detections terminate, and LED screen show " detect and terminate ".
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. thermostatic type hot-wire anemometer detection system, the custom circuit of described thermostatic type hot-wire anemometer comprises Wheatstone bridge, current-limiting protection circuit, amplifier, offset signal module and current driving circuit, wherein, the input end of Wheatstone bridge is connected with the output terminal of current driving circuit; The output signal of amplifier superposes the input end of rear input current driving circuit with the output signal of offset signal module; Current-limiting protection circuit is arranged in the brachium pontis at hot line place in Wheatstone bridge, for the protection of hot line;
It is characterized in that:
Described detection system comprises relay module, constant current source module, hot line substitutional resistance, the first to the 3rd fixed resistance, controls acquisition module, display module and detector switch;
Described relay module comprises the first to the 3rd single channel relay, the first to the 3rd two-way relay and relay drive unit;
Described relay drive unit respectively with the first is connected, for driving the described first to the 3rd single channel relay, the first to the 3rd two-way relay work to the control end of the control end of the 3rd single channel relay, the first to the 3rd two-way relay;
Described first single channel relay, the second single channel relay are separately positioned on the input end of Wheatstone bridge two brachium pontis, and its Chang Kaiduan all connects the input end of constant current source module, for realizing the switching between the mode of operation of bridge road;
Described 3rd single channel relay is arranged between the hot line of Wheatstone bridge and hot line substitutional resistance, for realizing the switching in Wheatstone bridge between hot line and hot line substitutional resistance;
Described first two-way relay is arranged in current-limiting protection circuit, for realizing the break-make of hot line place brachium pontis in Wheatstone bridge;
The common port of described second two-way relay is connected with the input end of amplifier, and normal-closed end is connected with the output terminal of Wheatstone bridge, and Chang Kaiduan connects one end of the first fixed resistance, one end of the second fixed resistance respectively;
The common port of described 3rd two-way relay is by the 3rd fixed resistance ground connection, and normal-closed end is unsettled, and Chang Kaiduan connects one end of constant current source module, the first fixed resistance respectively;
The other end of described first fixed resistance, the other end ground connection of the second fixed resistance;
Described bridge road current-limiting protection circuit is connected with relay drive unit, controls the first two-way relay work by it;
Described control acquisition module is connected with relay drive unit, controls the first to the 3rd single channel relay, the second to the 3rd two-way relay work by it;
Described control acquisition module is also connected with constant current source module, offset signal module, detector switch, display module respectively;
The instruction that described constant current source module is used for according to controlling acquisition module produces corresponding electric current;
Described detector switch is used for sending sense command to control acquisition module;
Described display module is for showing testing result.
2. thermostatic type hot-wire anemometer detection system according to claim 1, it is characterized in that, described control acquisition module is based on ARM chip, its output terminal producing DO signal is connected with the input end of relay drive unit, the output terminal producing DA signal is connected with the input end of constant current source module, the input end of offset signal module, and when receiving sense command, CTA voltage is by controlling the AD input end collection of acquisition module.
3. thermostatic type hot-wire anemometer detection system according to claim 1, is characterized in that, described display module adopts LED screen.
4. thermostatic type hot-wire anemometer detection system according to claim 1, is characterized in that, described relay driving module adopts ULN2003 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510703025.2A CN105242073B (en) | 2015-10-26 | 2015-10-26 | Thermostatic type hot-wire anemometer detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510703025.2A CN105242073B (en) | 2015-10-26 | 2015-10-26 | Thermostatic type hot-wire anemometer detecting system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105242073A true CN105242073A (en) | 2016-01-13 |
| CN105242073B CN105242073B (en) | 2018-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510703025.2A Expired - Fee Related CN105242073B (en) | 2015-10-26 | 2015-10-26 | Thermostatic type hot-wire anemometer detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402314A (en) * | 2017-08-31 | 2017-11-28 | 北京航空航天大学 | Temp measuring method and system based on hot-wire anemometer |
| CN111624363A (en) * | 2020-05-27 | 2020-09-04 | 中国空气动力研究与发展中心高速空气动力研究所 | Hot wire anemometer calibration method considering influence of fluid compressibility |
| CN113465872A (en) * | 2021-06-30 | 2021-10-01 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Hot wire anemograph suitable for high-speed flow field measurement |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094246A (en) * | 1990-07-19 | 1992-03-10 | R. J. Instruments | Hot wire anemometer and pulmonary gas flow monitor combination capable of fast accurate calibration |
| JP2005091132A (en) * | 2003-09-17 | 2005-04-07 | Shibata Kagaku Kk | Secular change tester and calibrating device for hot wire anemometer |
| CN2836015Y (en) * | 2005-06-28 | 2006-11-08 | 北京凌天世纪自动化技术有限公司 | Automatic anemometer tester |
| CN201319039Y (en) * | 2008-12-19 | 2009-09-30 | 北京丰隆技术有限公司 | Anemoscope |
| US20130088350A1 (en) * | 2011-10-05 | 2013-04-11 | William M. Stein | Wind-powered alarm anemometer |
| CN104360100A (en) * | 2014-10-31 | 2015-02-18 | 苏州宏瑞净化科技有限公司 | High-precision anemograph |
| CN104729571A (en) * | 2013-12-20 | 2015-06-24 | 西安欣东源电气有限公司 | Line temperature monitoring device with anemoscope |
| CN205157579U (en) * | 2015-10-26 | 2016-04-13 | 南京航空航天大学 | Thermostatic type hot wire anemometer detecting system |
-
2015
- 2015-10-26 CN CN201510703025.2A patent/CN105242073B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5094246A (en) * | 1990-07-19 | 1992-03-10 | R. J. Instruments | Hot wire anemometer and pulmonary gas flow monitor combination capable of fast accurate calibration |
| JP2005091132A (en) * | 2003-09-17 | 2005-04-07 | Shibata Kagaku Kk | Secular change tester and calibrating device for hot wire anemometer |
| CN2836015Y (en) * | 2005-06-28 | 2006-11-08 | 北京凌天世纪自动化技术有限公司 | Automatic anemometer tester |
| CN201319039Y (en) * | 2008-12-19 | 2009-09-30 | 北京丰隆技术有限公司 | Anemoscope |
| US20130088350A1 (en) * | 2011-10-05 | 2013-04-11 | William M. Stein | Wind-powered alarm anemometer |
| CN104729571A (en) * | 2013-12-20 | 2015-06-24 | 西安欣东源电气有限公司 | Line temperature monitoring device with anemoscope |
| CN104360100A (en) * | 2014-10-31 | 2015-02-18 | 苏州宏瑞净化科技有限公司 | High-precision anemograph |
| CN205157579U (en) * | 2015-10-26 | 2016-04-13 | 南京航空航天大学 | Thermostatic type hot wire anemometer detecting system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402314A (en) * | 2017-08-31 | 2017-11-28 | 北京航空航天大学 | Temp measuring method and system based on hot-wire anemometer |
| CN111624363A (en) * | 2020-05-27 | 2020-09-04 | 中国空气动力研究与发展中心高速空气动力研究所 | Hot wire anemometer calibration method considering influence of fluid compressibility |
| CN111624363B (en) * | 2020-05-27 | 2021-11-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Hot wire anemometer calibration method considering influence of fluid compressibility |
| CN113465872A (en) * | 2021-06-30 | 2021-10-01 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Hot wire anemograph suitable for high-speed flow field measurement |
| CN113465872B (en) * | 2021-06-30 | 2023-07-21 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Hot wire anemometer suitable for high-speed flow field measurement |
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|---|---|
| CN105242073B (en) | 2018-08-28 |
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